request for David Littleboy
I have always wondered if lenses for the Mamiya TLRs were exactly the
same or the viewing lens was the result of QC testing and found to be of poorer quality and therefore used as a viewing lens. Would you be able to contact Mamiya's Japanese office and ask them? |
request for David Littleboy
"RolandRB" wrote in message om... I have always wondered if lenses for the Mamiya TLRs were exactly the same or the viewing lens was the result of QC testing and found to be of poorer quality and therefore used as a viewing lens. Would you be able to contact Mamiya's Japanese office and ask them? That's not the sort of question one is likely to get a straight answer to. Watch this space. (It's 10:00 pn here now.) David J. Littleboy Tokyo, Japan |
request for David Littleboy
Hi David! ;-) quoting from http://medfmt.8k.com/mf/mamiyatlrlens.html Roland wrote I've taken apart both viewing and taking lenses for cleaning and both the taking and viewing lenses look identical to each other and are constructed the same. This includes taking out individual lens elements for cleaning. I've swapped them round and noticed no difference at all. They would seem to be identical twins. So next time you see one for sale on ebay with a slightly spoiled taking lens then help yourself to a bargain. endquote these posters suggest they are the same for these mamiya tlr lenses... In many other TLRs, of course, the viewing lens is faster so as to provide narrowed DOF and sharper focusing, or less complex as it is not being used to make the photo, just an image to focus (fewer elements etc.). if you do swap lenses, be sure to recollimate the new setup, as shims will likely need to be set to make them match up again... hope this helps bobm -- ************************************************** ********************* * Robert Monaghan POB 752182 Southern Methodist Univ. Dallas Tx 75275 * ********************Standard Disclaimers Apply************************* |
request for David Littleboy
"Bob Monaghan" wrote: Hi David! ;-) quoting from http://medfmt.8k.com/mf/mamiyatlrlens.html Roland wrote I've taken apart both viewing and taking lenses for cleaning and both the taking and viewing lenses look identical to each other and are constructed the same. This includes taking out individual lens elements for cleaning. I've swapped them round and noticed no difference at all. They would seem to be identical twins. So next time you see one for sale on ebay with a slightly spoiled taking lens then help yourself to a bargain. endquote these posters suggest they are the same for these mamiya tlr lenses... In many other TLRs, of course, the viewing lens is faster so as to provide narrowed DOF and sharper focusing, or less complex as it is not being used to make the photo, just an image to focus (fewer elements etc.). if you do swap lenses, be sure to recollimate the new setup, as shims will likely need to be set to make them match up again... FWIW, Mamiya's comment is that the lenses are matched closely for focal length, and that there really isn't a large difference between them. But the taking lens will, in most cases, exhibit higher resolution than the viewing lens. No surprisesg. Also, FWIW, they were quite friendly and happy to discuss it. The receptionist who answered the phone immediately got me to someone who sounded quite sensible. David J. Littleboy Tokyo, Japan |
"Bob Monaghan" wrote: Hi David! ;-) quoting from http://medfmt.8k.com/mf/mamiyatlrlens.html Roland wrote I've taken apart both viewing and taking lenses for cleaning and both the taking and viewing lenses look identical to each other and are constructed the same. This includes taking out individual lens elements for cleaning. I've swapped them round and noticed no difference at all. They would seem to be identical twins. So next time you see one for sale on ebay with a slightly spoiled taking lens then help yourself to a bargain. endquote these posters suggest they are the same for these mamiya tlr lenses... In many other TLRs, of course, the viewing lens is faster so as to provide narrowed DOF and sharper focusing, or less complex as it is not being used to make the photo, just an image to focus (fewer elements etc.). if you do swap lenses, be sure to recollimate the new setup, as shims will likely need to be set to make them match up again... FWIW, Mamiya's comment is that the lenses are matched closely for focal length, and that there really isn't a large difference between them. But the taking lens will, in most cases, exhibit higher resolution than the viewing lens. No surprisesg. Also, FWIW, they were quite friendly and happy to discuss it. The receptionist who answered the phone immediately got me to someone who sounded quite sensible. David J. Littleboy Tokyo, Japan |
request for David Littleboy
"David J. Littleboy" wrote in message ...
"Bob Monaghan" wrote: Hi David! ;-) quoting from http://medfmt.8k.com/mf/mamiyatlrlens.html Roland wrote I've taken apart both viewing and taking lenses for cleaning and both the taking and viewing lenses look identical to each other and are constructed the same. This includes taking out individual lens elements for cleaning. I've swapped them round and noticed no difference at all. They would seem to be identical twins. So next time you see one for sale on ebay with a slightly spoiled taking lens then help yourself to a bargain. endquote these posters suggest they are the same for these mamiya tlr lenses... In many other TLRs, of course, the viewing lens is faster so as to provide narrowed DOF and sharper focusing, or less complex as it is not being used to make the photo, just an image to focus (fewer elements etc.). if you do swap lenses, be sure to recollimate the new setup, as shims will likely need to be set to make them match up again... FWIW, Mamiya's comment is that the lenses are matched closely for focal length, and that there really isn't a large difference between them. But the taking lens will, in most cases, exhibit higher resolution than the viewing lens. No surprisesg. Also, FWIW, they were quite friendly and happy to discuss it. The receptionist who answered the phone immediately got me to someone who sounded quite sensible. David J. Littleboy Tokyo, Japan At last. Thankyou. I'm guessing the higher resolutions for the taking lens will show up more at wider apertures when the resolution is not diffraction limited. |
request for David Littleboy
"David J. Littleboy" wrote in message ...
"Bob Monaghan" wrote: Hi David! ;-) quoting from http://medfmt.8k.com/mf/mamiyatlrlens.html Roland wrote I've taken apart both viewing and taking lenses for cleaning and both the taking and viewing lenses look identical to each other and are constructed the same. This includes taking out individual lens elements for cleaning. I've swapped them round and noticed no difference at all. They would seem to be identical twins. So next time you see one for sale on ebay with a slightly spoiled taking lens then help yourself to a bargain. endquote these posters suggest they are the same for these mamiya tlr lenses... In many other TLRs, of course, the viewing lens is faster so as to provide narrowed DOF and sharper focusing, or less complex as it is not being used to make the photo, just an image to focus (fewer elements etc.). if you do swap lenses, be sure to recollimate the new setup, as shims will likely need to be set to make them match up again... FWIW, Mamiya's comment is that the lenses are matched closely for focal length, and that there really isn't a large difference between them. But the taking lens will, in most cases, exhibit higher resolution than the viewing lens. No surprisesg. Also, FWIW, they were quite friendly and happy to discuss it. The receptionist who answered the phone immediately got me to someone who sounded quite sensible. David J. Littleboy Tokyo, Japan At last. Thankyou. I'm guessing the higher resolutions for the taking lens will show up more at wider apertures when the resolution is not diffraction limited. |
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